If Deus Ex: HR had been any longer, I'm not sure if I would have even finished it. I found that game to be fairly monotonous as far as the repetition of the environments. So much so that I never even played the DLC, nor have I ever felt any desire to replay the game in the future. I still have nightmares about turning a corner and seeing another 20 office desks to search through.

I thought Risen was fine in terms of completion time, but I also agree with many that the island was too small in terms of exploration.

The Witcher 2 was definitely too short. Although it is made up for in part by how different the two playthroughs are.